Where's the vault-tec headquarters key for the mainframe

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There´s three computers on the mainframe level which must be accessed in order to unlock the mainframe door. They all include a short description on how to access the mainframe (basically giving clearance from each computer) and allow you to switch off the masterbrain (which then also shuts down all automatic defenses/robots). Golan2781 09:14, 14 February 2009 (UTC)

You don't need the key. If you go to the server room, you can jump up on the servers from the pipes next to the wall. If you look up to the masterbrain you can interract with it. rozsdas 17:58, 15 May 2009 (CET)